Fortinet security patch release for CVE-2025-64155
Security Patch Release
Summary
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Fortinet released security updates for FortiSIEM and FortiFone, closing critical vulnerabilities that could let unauthenticated attackers achieve code execution or expose device configuration on affected systems. The FortiSIEM flaw, CVE-2025-64155, impacts specific Super and Worker nodes and was rated 9.4/10.0. A separate FortiFone issue, CVE-2025-47855, could leak configuration data through a crafted HTTP(S) request. Fortinet also advised customers to upgrade affected releases and, for CVE-2025-64155, restrict access to phMonitor port 7900.
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Timeline
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14.01.2026 02:00 3 articles · 4mo ago
Fortinet releases fixes for FortiSIEM and FortiFone
Mitigation Patch UpdateFortinet released updates on January 14, 2026 to fix CVE-2025-64155 in FortiSIEM and CVE-2025-47855 in FortiFone, providing fixed releases for affected versions and recommending that customers restrict access to phMonitor port 7900 while upgrading.
Show sources
- Fortinet Fixes Critical FortiSIEM Flaw Allowing Unauthenticated Remote Code Execution — thehackernews.com — 14.01.2026 13:53
- Fortinet Fixes Critical FortiSIEM Flaw Allowing Unauthenticated Remote Code Execution — thehackernews.com — 14.01.2026 13:53
- Hackers now exploiting critical Fortinet FortiSIEM flaw in attacks — www.bleepingcomputer.com — 16.01.2026 12:29
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14.08.2025 03:00 1 articles · 9mo ago
Horizon3.ai reports FortiSIEM CVE-2025-64155
Initial DisclosureHorizon3.ai researcher Zach Hanley reported CVE-2025-64155 in FortiSIEM on August 14, 2025, describing an OS command injection flaw in phMonitor that could let an unauthenticated attacker execute unauthorized code or commands via crafted TCP requests and chain arbitrary file write with privilege escalation on affected Super and Worker nodes.
Show sources
- Fortinet Fixes Critical FortiSIEM Flaw Allowing Unauthenticated Remote Code Execution — thehackernews.com — 14.01.2026 13:53